2 u010089114 u010089114 于 2015.06.25 17:16 提问

java服务器端出错java.io.StreamCorruptedException

报错信息:java.io.StreamCorruptedException: invalid stream header: 64000000
at java.io.ObjectInputStream.readStreamHeader(Unknown Source)
at java.io.ObjectInputStream.(Unknown Source)
at org.lxh.server.ServerThreadUtil.run(ServerThreadUtil.java:30)
at java.lang.Thread.run(Unknown Source)
出错代码如下:
public void run() { // 覆写run()方法
try {
PrintStream out = new PrintStream(
client.getOutputStream()); // 取得客户端输出流

        ObjectInputStream ois = new ObjectInputStream(client
                .getInputStream());                 // 这里出错了
        this.upload = (UploadFile) ois.readObject(); // 读取对象
        System.out.println("文件标题:" + this.upload.getTitle());
        System.out.println("文件类型:" + this.upload.getMimeType());
        System.out.println("文件大小:" + this.upload.getContentLength());
        out.print(saveFile());                      // 返回标记
    } catch (Exception e) {
        e.printStackTrace();
    } finally {
        try {
            this.client.close();                    // 关闭客户端连接
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

2个回答

xby1993
xby1993   2015.06.25 19:31

client?是属于哪个类的对象?

frank_20080215
frank_20080215   2015.06.25 22:20

The provided test code serializes an object to a ByteArrayOutputStream,
converts the generated byte array into a string using the
ByteArrayOutputStream.toString() method, converts the string back into a byte
array using the String.getBytes() method, and then attempts to deserialize the
object from the byte array using a ByteArrayInputStream. This procedure will
in most cases fail because of the transformations that take place within
ByteArrayOutputStream.toString() and String.getBytes(): in order to convert the
contained sequence of bytes into a string, ByteArrayOutputStream.toString()
decodes the bytes according to the default charset in effect; similarly, in
order to convert the string back into a sequence of bytes, String.getBytes()
encodes the characters according to the default charset.

Converting bytes into characters and back again according to a given charset is
generally not an identity-preserving operation. As the javadoc for the
String(byte[], int, int) constructor (which is called by
ByteArrayOutputStream.toString()) states, "the behavior ... when the given
bytes are not valid in the default charset is unspecified". In the test case
provided, the first two bytes of the serialization stream, 0xac and 0xed (see
java.io.ObjectStreamConstants.STREAM_MAGIC), both get mapped to the character
'?' since they are not valid in the default charset (ISO646-US in the JDK I'm
running). The two '?' characters are then mapped back to the byte sequence
0x3f 0x3f in the reconstructed data stream, which do not constitute a valid
header.

The solution, from the perspective of the test case, is to use
ByteArrayOutputStream.toByteArray() instead of toString(), which will yield the
raw byte sequence; this can then be fed directly to the
ByteArrayInputStream(byte[]) constructor.

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